Roof shaving machine

ABSTRACT

A machine for shaving expanded plastic on a roof structure wherein the machine includes a rotatable drum extending transversely of a frame carrying front and rear ground engaging wheels. The rear wheels are vertically adjustable to vary the thickness of the drum cut. The rear wheels are connected to the frame by a pair of pivotal arms and a vertically adjustable adjustment unit is connected between the frame and an axle from which the rear wheels are mounted. An engine is carried on the frame above the drum. A plurality of spaced apart longitudinally extending scarfing blades are provided on the exterior surface of the drum.

[ June 19, 1973 United States Patent 1 Lenzner 1,616,895 2/1927Grabowski....................... l45/4.l X

[ ROOF SHAVING MACHINE [76] Inventor: James Lenzner, 123 Arizona,

Waterloo, lowa Nov. 8, 1971 Appl. No.: 196,645

Primary Examiner-Ernest R. Purser AttorneyZarley, McKee & Thomte 22Filed:

[57] ABSTRACT A machine for shaving expanded plastic on a roof structurewherein the machine includes a rotatable drum extending transversely ofa frame car Related U.S. Application Data [62] Division of Ser. No.752,597, Aug. 14, 1968, Pat. No.

rying front and rear ground engaging wheels. The rear wheels arevertically adjustable to vary the thickness of the drum cut. The rearwheels are connected to the frame by a pair of pivotal arms and avertically adjustable adjustment unit is connected between the frame andan axle from which the rear wheels are mounted. An engine is carried onthe frame above the drum. A plurality of spaced apart longitudinallyextending scarfing blades 2 MU7M Me u S U W T 5 2 N 9 n E 3." d W EA .IP2mm mm n :1 Mb e n Rm .u

T "-8 I .0 N 0 m U 0 td Umm 1]] 1 2 8 6 555 5 lll are provided on theexterior surface of the drum.

8 e r u g F. g n i w a r D 8 m i a 1 c 1 9 x B w w W2 9 2 2,584,7382/1952 1,415,949 5/1922 Perelman..............................

PArimiuJvm 3.740.099

Eyes 2 7944 J -2 .5"

ROOF SHAVING MACHINE This is a divisional application of Ser. No.752,597 filed Aug. 14, 1968, Method of Sealing And Insulating A RoofConstruction and now US. Pat. No. 3,698,972.

A flat or slope roof structure or the like which is not shingled issometimes covered with tar and tar paper and other protective coatingsand perhaps some rock, mineral aggregate or other protective coatings.The sealing methods without shaving to a smooth surface are generallyunsatisfactory.

It is a feature of this invention to apply a thin film of sprayedplastic onto the roof structure first. The spray plastic develops acellular type which will immediately expand 20 to 30 times its filmthickness and will set up in five to ten seconds and thereupon may beshaved to a smooth surface. The expanded layer of insulative plastic mayeasily be as thick. as eight inches after having been sprayed on in afilm having athickness of onetwentieth inch to one thirty-second inch.The spraying of the cellular plastic includes using a blowing agentwhich decomposes to liberate a gas. This urethane or expanded plasticfoam insulation can be applied to any roof deck whether it be wood,steel, concrete or other forms of roof decking material.

Upon completion of the application of the expanded cellular plastic,preferably urethane foam, the foam is shaved with a hand-operatedshaving device including a rotatable cylinder carried on a frame drivenby a gas engine. Longitudinally extending blades are formed on thecylinder and the cylinder is adjustably positioned above the workingsurface by adjustment of ground support wheels carried on a pivotal axiswhich may be raised and lowered to provide the desired cuttingthickness. Next, the shavings are swept or vacuumed in preparation forapplication of tar, tar paper, or other protective coatings.

The cellular plastic urethane foam not only has sealing and insulativeproperties but provides substantial structural support strength and addsonly a very minimum additional weight to the roof covering.

These and other features and advantages of this invention will becomereadily apparent to those skilled in the art upon reference to thefollowing description when taken into consideration with theaccompanying drawings wherein: a

FIG. 1 is a perspective view of the shaving machine used in the methodof this invention;

FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. 1 of theshaving machine;

FIG. 3 is a fragmentary cross-sectional view of a roof structure beforeany covering material is applied;

FIG. 4 is a cross-sectional view showing a thin film of cellular plastichaving been applied to the roof structure;

FIG. 5 is a cross-sectional view of the roof structure illustrating thecellular plastic inits expanded condition and having a rough outersurface;

FIG. 6 is a cross-sectional view of the roof structure 4 illustratingthe expanded plastic having been shaved with shavings remaining thereon;

FIG. 7 illustrates the roof structure after the shavings have beenremoved leaving a smooth surface; and

FIG. 8 is a cross-sectional view of the roof structure illustrating thelaminated package of expanded plastic, tar, tar paper, tar and gravel orother protective coatmg.

The method of this invention involves a roof structure generallyreferred to by the reference numeral 10 in FIG. 3 which includessupporting 2 X 4s 12 and 14 on which flooring boards 16 are placed.

The first step in the method of this invention is to apply from a spraygun a thin film, one-twentieth to one thirty-second inches thick ofpreferably urethane cellular plastic 18 and then wait for approximatelyfive seconds for it to expand 20 to 30 times its original thickness tothe thickness shown in FIG. 5 at 20. The outer surface 22 is rough andundulated and thus is shaved to a smooth surface 24 as seen in FIGS. 6and 7. The shavings 26 in FIG. 6 are produced by the machine generallyreferred to by the reference numeral 30 of FIGS. 1 and 2 and will bediscussed in detail hereinafter.

The next step is the application if desired of tar 32 and tar paper 34with a final layer of film of tar 36 onto the expanded urethane foam 24.Finally, gravel or rock 38 is applied to the top film of tar 36 tocomplete the roof covering indicated at 40 in FIG. 8.

The shaving machine 30 includes a frame 42 having front support wheels44 positioned on downwardly and forwardly extending brackets 46..Adjustable support depth gauge wheels 48 are carried on arms 50pivotally connected to the rear of the frame 42 between a pair ofdownwardly extending brackets 54. An axle 56 extends between the twowheels 48 and through the forward ends of the pivotal arms 50. Anupwardly extending adjustment unit 60 including a threaded bolt 62 and asocket sleeve 64 is provided wherein the bolt 62 extends through anupwardly extending frame member 66. Lock nuts 68 are provided onopposite sides of the frame member 66 to retain the desired extension ofthe adjustment unit 60. A handle member 70 is positioned on the upperexposed end of the bolt 62 for manual adjustment of the adjustment unit60.

The frame 42 intermediate its ends carries thereunder a poweredrotatable cylinder 72 having uniformly spaced apart longitudinallyextending cutting blades 74 around its periphery. A shield 76 extendsabove the cutting drum 72 to retain the shavings 26 below the shavingmachine. A gasoline engine 78 is mounted on a stationary support 80 atthe rear and is pivotally ad justable upwardly by a threaded bolt member82 at the forward end which when adjusted upwardly tightens a drive belt92 connected to the engine 78. Accordingly the desired tension in thedrive belt 92 is maintained by adjustment of the bolt 82 which pivotallyraises and lowers the motor 78 about the pivotal axis extending throughthe support member 80 at the rear of the engine.

A rearwardly extending control handle is provided for steering theshaving machine. The handle 100 includes a pair of side membersinterconnected by a cross member 102 and has upwardly extending supportbraces 104 at its lower end.

Thus it is seen that in operation a roof covering may be quickly, easilyand inexpensively applied to most roof structures and provide effectivesealing and insulating of the roof as well as increasing its structuralstrength through the use of the cellular plastic urethane foam at aminimum increase in total roof weight. The urethane foam is quicklyapplied without any mcssiness since it quickly sets up in five secondsor less and may be shaved to the desired smoothness. The finalapplication of tar, tar paper and tar with a layer of rock or otherprotective coatings completes the roof covering and provides theultimate in a roof structure. It is apparent that if tar and tar paperand rock and other protective coatings were used to give the sameinsulative and sealing properties of the cellular expanded urethane theweight and cost would be extremely prohibitive. Further, urethane is anunusually fine material for this purpose since it is additionally notinflamable and practically no solvent will effect it thus the solventsin tars will not adversely effect the urethane foam. In addition it isextremely low in transmission of water vapor and absorption of water.The smooth shaved surface 24 provided by the shaving machine provides anexcellent surface for the adhesion of the tar material to the expandedcellular plastic 20.

I claim:

1. A shaving machine comprising,

a frame having forward and rearward ground engaging wheels,

a rearwardly and upwardly extending handle connected tosaid frame,

a powered rotatable shaving drum on said frame between said forward andrearward wheels, and said drum having cutting means thereon,

said cutting means including longitudinally extending scarfing blades,

said rearward wheels having height adjustment means to vary the cuttingdepth of said shaving drum,

the axis of rotation of said forward and rearward wheels and saidshaving drum being disposed in parallel relationship, and said armsbeing pivotally connected to said frame rearwardly of said rearwardwheels,

an engine being mounted on said frame above said shaving drum to powersaid shaving drum, and

said height adjustment means for said rearward wheels including an axleconnected to a pair of arms pivotally connected to said frame rearwardlyof said rearward wheels and a telescoping adjustment unit is connectedbetween said axle and said frame for pivoting said arms therebyselectively varying the height of said shaving drum above a support andwork surface, said adjustment unit being manually adjustable andincluding a threaded shaft received in a threaded sleeve and saidthreaded shaft being manually rotatable.

1. A shaving machine comprising, a frame having forward and rearwardground engaging wheels, a rearwardly and upwardly extending handleconnected to said frame, a powered rotatable shaving drum on said framebetween said forward and rearward wheels, and said drum having cuttingmeans thereon, said cutting means including longitudinally extendingscarfing blades, said rearward wheels having height adjustment means tovary the cutting depth of said shaving drum, the axis of rotation ofsaid forward and rearward wheels and said shaving drum being disposed inparallel relationship, and said arms being pivotally connected to saidframe rearwardly of said rearward wheels, an engine being mounted onsaid frame above said shaving drum to power said shaving drum, and saidheight adjustment means for said rearward wheels including an axleconnected to a pair of arms pivotally connected to said frame rearwardlyof said rearward wheels and a telescoping adjustment unit is connectedbetween said axle and said frame for pivoting said arms therebyselectively varying the height of said shaving drum above a support andwork surface, said adjustment unit being manually adjustable andincluding a threaded shaft received in a threaded sleeve and saidthreaded shaft being manually rotatable.